Add CookFlavor property for projects. #79

Job	Run time
Timestamp	13s
Test StringEnum Trimmed	29s
Build AutoDiscovery	51s
Build Mac Logging	31s
Build and Test Libraries on Windows	8m 51s
Build macOS Pass 1	5m 2s
Build Libraries on macOS	5m 44s
Build Windows Pass 1	7m 54s
Build macOS Shim	40s
Build Windows Shim	1m 6s
Build Windows UEFS	3m 16s
Build macOS UEFS	1m 20s
Build macOS Pass 2	5m 23s
Build Windows Pass 2	8m 18s
Publish UEFS Container	0s
Publish to NuGet	0s
Publish to GitHub	0s
	49m 38s

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